{"id":8577,"date":"2019-05-22T16:09:13","date_gmt":"2019-05-22T16:09:13","guid":{"rendered":"http:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/nodes_of_ranvier\/"},"modified":"2019-05-22T16:09:13","modified_gmt":"2019-05-22T16:09:13","slug":"nodes_of_ranvier","status":"publish","type":"post","link":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/nodes_of_ranvier\/","title":{"rendered":"Nodes of Ranvier"},"content":{"rendered":"<p>Periodic gaps, about 1 micrometer wide, between myelin sheath (Schwann) cells on axons of particular neurons (see figure below). &nbsp;Fat being a good insulator means that the myelin sheaths facilitate the speed of an electrical impulse travelling along an axon. &nbsp;The impulse jumps from node to the next as a speed that can attain 120 m\/s, something referred to as saltatory conduction (a speed much faster than obtains for non-myelinated axons). &nbsp;The impulse travels along the axon by a process of de-polarization and re-polarization of the nerve membrane; thus at the unmyelinated gaps or nodes, electrical activity is&nbsp;generated. &nbsp;The nodes of Ranvier also function to allow nutrients to enter and leave a neuron. &nbsp;The nodes were first described by the histologist <a href=\"http:\/\/notesofranvier.blogspot.co.uk\/2012\/06\/unsung-scientist-louis-antoine-ranvier.html\" class=\"cc-route-enabled\" target=\"_self\" data-editable-link=\"http:\/\/notesofranvier.blogspot.co.uk\/2012\/06\/unsung-scientist-louis-antoine-ranvier.html&amp;target=_self\" rel=\"noopener noreferrer\">Louis-Antoinine Ranvier <\/a>(1835-1922) in 1878 who considered them to be constrictions.&nbsp;<\/p>\n<p style=\"text-align: center;\" class=\"\">\n<\/p>\n<p><img decoding=\"async\" src=\"..\/wp-content\/uploads\/2019\/05\/Nodes-of-Ranvier2.jpg\" \/><\/div>\n<\/div>\n<p style=\"text-align: center;\" class=\"\">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;Nodes of Ranvier: the nodes occur as gaps in the myelin sheath that envelopes an axon. &nbsp;<\/p>\n<p>See&nbsp;Action potential, Axon,&nbsp;Axon collateral, Myelin, Neruon, Schwann cells&nbsp;<\/p>\n<p><\/body><\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Periodic gaps, about 1 micrometer wide, between myelin sheath (Schwann) cells on axons of particular neurons (see figure below). &nbsp;Fat being a good insulator means that the myelin sheaths facilitate the speed of an electrical impulse travelling along an axon. &nbsp;The impulse jumps from node to the next as a speed that can attain 120 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/nodes_of_ranvier\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Nodes of Ranvier&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2],"class_list":["post-8577","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-glossary","entry"],"_links":{"self":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts\/8577","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/comments?post=8577"}],"version-history":[{"count":0,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts\/8577\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/media?parent=8577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/categories?post=8577"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/tags?post=8577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}